A:
Positive:
1 x 201719455 x 403438917 x 118658543 x 46911585 x 237317215 x 93823731 x 275953655 x 5519
Negative:
-1 x -20171945-5 x -4034389-17 x -1186585-43 x -469115-85 x -237317-215 x -93823-731 x -27595-3655 x -5519
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 20,171,945, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 20,171,945 | |
| -1 | -20,171,945 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,171,945.
Example:
1 x 20,171,945 = 20,171,945
and
-1 x -20,171,945 = 20,171,945
Notice both answers equal 20,171,945
With that explanation out of the way, let's continue. Next, we take the number 20,171,945 and divide it by 2:
20,171,945 ÷ 2 = 10,085,972.5
If the quotient is a whole number, then 2 and 10,085,972.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 20,171,945 | |
| -1 | -20,171,945 |
Now, we try dividing 20,171,945 by 3:
20,171,945 ÷ 3 = 6,723,981.6667
If the quotient is a whole number, then 3 and 6,723,981.6667 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 20,171,945 | |
| -1 | -20,171,945 |
Let's try dividing by 4:
20,171,945 ÷ 4 = 5,042,986.25
If the quotient is a whole number, then 4 and 5,042,986.25 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 20,171,945 | |
| -1 | 20,171,945 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 43 | 85 | 215 | 731 | 3,655 | 5,519 | 27,595 | 93,823 | 237,317 | 469,115 | 1,186,585 | 4,034,389 | 20,171,945 |
| -1 | -5 | -17 | -43 | -85 | -215 | -731 | -3,655 | -5,519 | -27,595 | -93,823 | -237,317 | -469,115 | -1,186,585 | -4,034,389 | -20,171,945 |
Here are some more numbers to try:
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